All files / modules/tts aliyun-realtime.provider.ts

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import WebSocket from 'ws';
import fs from 'fs';
import path from 'path';
import { config } from '../../config';
import { VoiceParams } from '../../types';
 
// 阿里云百炼 Qwen-TTS WebSocket 实时语音合成
// 文档: https://help.aliyun.com/zh/model-studio/qwen-tts-realtime
// 支持流式输入,适合长文本
 
export class AliyunRealtimeTtsProvider {
  private apiKey: string;
  private model: string;
  private voice: string;
  private baseUrl = 'wss://dashscope.aliyuncs.com/api-ws/v1/realtime';
 
  constructor() {
    // 从 models.json 统一获取百炼配置(已消除 dashscope 冗余配置源)
    const vendorConfig = (config.models as any).vendors?.bailian;
    this.apiKey = vendorConfig?.apiKey || '';
    this.model = this.model || 'qwen3-tts-instruct-flash-realtime';
    this.voice = (config.models as any).tts?.defaultVoice || 'Cherry';
  }
 
  // 语音合成(WebSocket 流式)
  async synthesize(
    text: string,
    voiceId: string,
    params: VoiceParams,
    outputPath: string
  ): Promise<string> {
    return new Promise((resolve, reject) => {
      const voice = voiceId || this.voice;
      const audioChunks: Buffer[] = [];
      let sessionId: string;
 
      console.log('🔊 [Qwen Realtime TTS] 建立 WebSocket 连接...');
 
      const ws = new WebSocket(this.baseUrl, {
        headers: {
          'Authorization': `Bearer ${this.apiKey}`,
          'X-DashScope-App': 'audio-tts',
        },
      });
 
      ws.on('open', () => {
        console.log('✅ [Qwen Realtime TTS] 连接已建立');
      });
 
      ws.on('message', (data) => {
        try {
          const message = JSON.parse(data.toString());
 
          switch (message.event) {
            case 'session.configed':
              // 配置成功,发送文本
              sessionId = message.session_id;
              console.log('📝 [Qwen Realtime TTS] Session ID:', sessionId);
 
              // 构建指令
              const instructions: string[] = [];
              if (params.speed !== 1) {
                const speedDesc = params.speed > 1 ? '语速较快' : '语速较慢';
                instructions.push(speedDesc);
              }
              if (params.pitch !== 0) {
                const pitchDesc = params.pitch > 0 ? '音调较高' : '音调较低';
                instructions.push(pitchDesc);
              }
 
              // 使用 server_commit 模式:直接发送完整文本,服务端自动处理分段
              const textMessage = {
                event: 'input_text_buffer.append',
                context: {
                  text: text,
                },
              };
              ws.send(JSON.stringify(textMessage));
              console.log('📤 [Qwen Realtime TTS] 文本已发送,长度:', text.length);
 
              // 发送 commit 触发合成
              const commitMessage = {
                event: 'input_text_buffer.commit',
              };
              ws.send(JSON.stringify(commitMessage));
              console.log('📤 [Qwen Realtime TTS] 触发语音合成...');
              break;
 
            case 'audio.stream':
              // 接收音频数据
              if (message.data) {
                const audioBuffer = Buffer.from(message.data, 'base64');
                audioChunks.push(audioBuffer);
              }
              break;
 
            case 'audio.finish':
              // 合成完成
              console.log('✅ [Qwen Realtime TTS] 合成完成');
 
              // 保存文件
              if (audioChunks.length > 0) {
                const dir = path.dirname(outputPath);
                if (!fs.existsSync(dir)) {
                  fs.mkdirSync(dir, { recursive: true });
                }
 
                const finalPath = outputPath.endsWith('.mp3') ? outputPath : outputPath.replace(/\.[^.]+$/, '.mp3');
                const finalBuffer = Buffer.concat(audioChunks);
                fs.writeFileSync(finalPath, finalBuffer);
                console.log(`✅ [Qwen Realtime TTS] 文件已保存: ${finalPath}, 大小: ${finalBuffer.length} bytes`);
                ws.close();
                resolve(finalPath);
              } else {
                ws.close();
                reject(new Error('Qwen Realtime TTS 未返回音频数据'));
              }
              break;
 
            case 'task.finished':
              // 任务完成
              ws.close();
              resolve(outputPath);
              break;
 
            case 'error':
              console.error('❌ [Qwen Realtime TTS] 错误:', message.message);
              ws.close();
              reject(new Error(`Qwen Realtime TTS 错误: ${message.message}`));
              break;
 
            default:
              // 忽略其他消息
              break;
          }
        } catch (err) {
          console.error('❌ [Qwen Realtime TTS] 解析消息失败:', err);
        }
      });
 
      ws.on('error', (err) => {
        console.error('❌ [Qwen Realtime TTS] WebSocket 错误:', err.message);
        reject(err);
      });
 
      ws.on('close', () => {
        console.log('🔌 [Qwen Realtime TTS] 连接已关闭');
      });
 
      // 超时处理
      setTimeout(() => {
        if (ws.readyState === WebSocket.OPEN) {
          ws.close();
          reject(new Error('Qwen Realtime TTS 请求超时'));
        }
      }, 120000); // 2分钟超时
    });
  }
}